CVE-2026-20309: Cisco Identity Services Engine Cross-Site Scripting Vulnerability
A vulnerability in the web-based management interface of Cisco Identity Services Engine (ISE) could allow an unauthenticated, remote attacker to conduct a reflected cross-site scripting (XSS) attack against a user of the interface. This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information.
Affected Software
Event History
Frequently Asked Questions
What does an attacker need to exploit this issue?
The attacker does not need authentication, but must persuade a user of the ISE web-based management interface to click a crafted link.
Who is exposed to the attack?
Users who access the affected ISE web-based management interface are the intended targets. The attack is reflected XSS, so exploitation occurs in the victim user's browser session rather than requiring the attacker to log in.
What could a successful attack allow?
It could execute arbitrary script in the context of the affected management interface and access sensitive information available through the user's browser.